API 5L GR.B PSL 1

A 0.50% maximum for copper, 0.50% maximum for nickel, 0.50% maximum for chromium, and 0.15% maximum for molybdenum.B For each reduction of 0.01% below the specified maximum concetration for carbon, an increase of 0.05% above the specified maximum concentration for manganese is permissible, up to a maximum of 1.65%C unless otherwise agreed, the sum of the niobium and vanadium contents shall be ≤0.06%.D The sum of the niobium ,vanadium and titanium concentratons shall be ≤0.06%.E Unless otheriwse agreed.F unless otherwise agreed, the sum of niobium, vanadium and titanium concentrations shall be ≤ 0.15%